Camcroderinfo Canon HF S21 full review

Color accuracy and noise levels not as good as the competition (color accuracy worse than the HF S11!)

Though there are good manual controls, shutter and aperture cannot be set independently

I wonder whether the improved low light performance comes at the expense of color and noise. If you're buying a camera, how would you choose between those two factors?

As they have been doing, Camcorderinfo includes a collection of test videos which can make you eyes pop.

In general, we can conclude that the features have improved, though the image quality hasn't.
(Not really on point, but a friend of mine has the Canon HF S10, and is very happy with it, so not improving the image quality doesn't mean it's a bad camera!)